how to go frame by frame on iphone video

Iam wondering if I can review a video I shot frame by frame on the iPhone. The video was shot on the iPhone. I have tried the feature that consists in expanding the frames under the video to get better control of the playback but it's not as precise as frame by frame for me. I know how to do it after the video is exported to QuickTime but it's
Changethe camera's video recording settings on iPhone. By default, Camera records video at 30 frames per second (fps). Depending on your iPhone model, you can choose other frame rates and video resolution settings. Faster frame rates and higher resolutions result in larger video files.
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how to go frame by frame on iphone video